When your operation requires heavy-duty power on the move, there is very little room for compromise. Whether you are managing a massive construction project, providing emergency backup for a data center, or powering a remote mining site, you need a machine that is as flexible as it is powerful. At Central States Diesel Generators, we are proud to showcase a “unicorn” in the pre-owned market: the Used Cummins DFHB QST30-G2 800 kW Rental-Grade Diesel Generator (CSDG# 4679).
Located at our facility in Katy, TX, this 1999 model unit is a testament to the longevity and engineering excellence of the Cummins brand. With just 8,276 hours on the clock and a fresh load test completed in February 2026, it is ready to ship nationwide and go to work immediately.
The Power of the Cummins QST30-G2 Engine
At the heart of this beast lies the legendary Cummins QST30-G2 engine. For those in the power generation industry, the “QST” designation is synonymous with “Quantom System Technology,” representing a significant leap forward in engine control and durability.
Technical Specifications of the QST30-G2
The QST30-G2 is a V12, 4-cycle industrial diesel engine with a massive 30.5L displacement. This isn’t just an engine; it’s a high-performance power plant designed to deliver 1200 HP at 1800 RPM.
Key technical highlights include:
- V12 Configuration: The V-angle design allows for a more compact footprint while providing a balanced, smooth operation with lower vibration: crucial for longevity in mobile applications.
- Turbocharged and Aftercooled: This setup ensures the engine breathes easily, providing maximum power density and excellent fuel efficiency even under heavy loads.
- Fast Load Response: One of the standout reputations of the QST30 series is its ability to handle sudden, large load steps. This is vital for facilities like hospitals or data centers where power must stabilize instantly during a utility failure.
- Rugged Construction: Built with a cast-iron block and forged steel crankshaft, the QST30-G2 is engineered for the “tough duty cycles” typical of industrial and rental environments.
Why “Rental-Grade” is the Gold Standard
You might see the term “Rental-Grade” and think it implies the machine has lived a hard life. In reality, in the world of used industrial generators, rental-grade units are often the most desirable. Why? Because they are built to be the most resilient, flexible, and well-protected units in a fleet.
1. Ultimate Portability
This unit (CSDG# 4679) is mounted on a heavy-duty tandem axle trailer. If you have multiple job sites or need to move your backup power source between facilities, a trailer-mounted unit is a game-changer. You don’t need a crane or a specialized rig for every move; you just need the right truck to hitch it to.
2. Massive Fuel Autonomy
One of the biggest headaches in remote power is refueling. This Cummins package includes an integrated 1,250-gallon fuel tank. At a 75% load, this unit can run for a significant duration before needing a refill, giving you peace of mind during extended outages or remote operations.
3. Sound Attenuation
Industrial generators are loud: there’s no way around it. However, this unit is housed in a 40 ft sound-attenuated enclosure. This makes it suitable for use in areas with noise ordinances or near residential zones where a standard open-skid generator would be prohibited.
Full Technical Specifications: CSDG# 4679
To help your engineering team make an informed decision, here are the detailed specs for this specific unit:
| Feature | Specification |
|---|---|
| Manufacturer | Cummins |
| Model | DFHB |
| CSDG# | 4679 |
| Standby Rating | 800 kW |
| Prime Rating | 725 kW |
| Engine | QST30-G2 (1200 HP) |
| Year | 1999 |
| Hours | 8,276 |
| Voltage | 277/480V (12-lead reconnectable) |
| Control Panel | PowerCommand 3100 Digital |
| Circuit Breaker | 1600 Amp Main-Line |
| Dimensions | 96″W x 480″L x 160″H |
| Weight | 40,000 lbs |
This unit also features a PowerCommand 3100 digital control panel, which offers advanced monitoring, protection, and autostart capabilities. Whether you’re using it for standby emergency power or prime power applications, the 3100 provides a user-friendly interface to keep your site powered safely.
Transparency: We Own What We Advertise
One of the core values at Central States Diesel Generators is transparency. Unlike many “brokers” you’ll find online, we actually own the inventory we advertise. When you see CSDG# 4679 on our site, it is sitting in our yard in Katy, TX, ready for your inspection or immediate shipment.
We don’t deal in “ghost listings.” Every used generator we sell, including this 800 kW Cummins, undergoes a rigorous quality and maintenance check. We recently completed a full load test on 2/25/2026 to ensure the unit performs exactly as it should under pressure.
Want the proof? You can download the official Cummins DFHB spec sheet and the 2026 Load Test Report directly from the product page. We believe in providing all the data up front so you can make an informed, timely purchase.
More Units Ready to Ship
While this 800 kW Cummins is a stellar choice, we understand that every facility has unique power requirements. If you need something slightly different: perhaps a new Caterpillar unit or a different kW range: we have a wide variety of top brands in stock, including Kohler, Blue Star Power Systems, and Generac.
We specialize in units ranging from 100 kW to 3000 kW. Our team of experienced engineers is always available to provide a personalized power consultation to ensure you’re getting the best equipment for your budget and durability needs.
Call to Action: Secure Your Power Today
At $149,900, this Cummins DFHB is priced to move. Given the current lead times for new equipment, a high-quality, low-hour used unit like this is the fastest way to secure your facility’s power future.
Ready to move forward? You have options:
- View the Listing: Check out all the photos and download the docs for CSDG# 4679 here.
- Contact Us: Give us a call or reach out online to discuss shipping rates or schedule an inspection.
- Browse Inventory: See our full real-time list of diesel generators for sale.
- Sell Your Unit: Have a generator you’re looking to offload? We buy used industrial generators nationwide.
Don’t wait for the next power outage to find out you’re unprepared. Secure a legend with the Cummins QST30-G2 today.
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